[PTX]

[Nathan Sidwell]

Alex pointed me at his ptx patch 
https://gcc.gnu.org/ml/gcc-patches/2015-10/msg03393.html but meanwhile I'd 
reorganized that part of the PTX backend.

This patch implements Alex's patch in the new code base.  There are some minor 
additions.
1) we also look inside vector types.
2) we only limit to Pmode, if the type's mode is BLKmode.  Those are the structs 
where we can't tell whether a pointer initialization will happen.

I think there's still some cleanup on the init emission -- now the object size 
is alwasy a multiple  of the element size, we don't have to deal with any 
trailing partial elements.


nathan
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